CN103682465A - Electric storage device - Google Patents
Electric storage device Download PDFInfo
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- CN103682465A CN103682465A CN201310367117.9A CN201310367117A CN103682465A CN 103682465 A CN103682465 A CN 103682465A CN 201310367117 A CN201310367117 A CN 201310367117A CN 103682465 A CN103682465 A CN 103682465A
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- electrode
- inner circumferential
- constriction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/24—Electrodes characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/32—Wound capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/02—Machines for winding capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/15—Solid electrolytic capacitors
- H01G9/151—Solid electrolytic capacitors with wound foil electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Provided is an electric storage device includes an electrode assembly, in which a positive electrode and a negative electrode in the shape of a sheet are wound with a separator sandwiched therebetween, wherein the electrode assembly has a flat shape and includes a first flat portion and a second flat portion, which are opposed to each other, and a first curved portion and a second curved portion which connect end portions of the first and second flat portions together, one of the positive electrode and the negative electrode covers an inner-circumferential end portion of the other electrode and is disposed on an innermost circumference of the electrode assembly, and an inner-circumferential end portion of the one of the electrodes causes an elastic force to act outwardly on the other electrode.
Description
Technical field
The present invention relates to a kind of charge storage element.
Background technology
In recent years, as the power source of vehicle (automobile, two-wheeled etc.) or various machine (carried terminal, subnotebook PC etc.), the charge storage element that employing can discharge and recharge.Charge storage element is such as having battery (lithium ion battery, Ni-MH battery etc.) and capacitor (double charge layer capacitor etc.).For example, provide various types of batteries.As one of them, a kind of battery is provided, it possesses the positive pole of sheet and negative pole dividing plate is clipped in the middle and the is reeled electrode body forming and the collector body being connected with this electrode body.
As shown in Fig. 9 (c), positive pole 21, negative pole 22 and dividing plate 23 are stacked according to the order of dividing plate 23, negative pole 22, dividing plate 23, positive pole 21.They be take and anodal 21 are outside mode is wound into cylindrical shape.Afterwards, this Bei Cong both sides, columnar side compressing, pressure is collapsed into flat and is out of shape thus.So, make electrode body.Or, according to the order of dividing plate 23, negative pole 22, dividing plate 23, positive pole 21, they are stacked from inner side, duplexer is wound into flat, make electrode body processed.
Shown in anodal 21 figure as figure (a), on the surperficial two sides of anodal current collection base material 21a, possesses positive electrode active material layer (positive active material coated portion) 21b.This positive electrode active material layer is for example by the surperficial one side coating positive active material coating at anodal current collection base material 21a, after making it dry, at the opposing face of anodal current collection base material 21a, apply equally positive active material coating, makes it dry and form.Anodal current collection base material 21a is for example formed by the aluminium foil of rectangular banded shape.
In more detail, the surperficial two sides coating positive active material coating except an end of positive pole 21 on the Width of anodal current collection base material 21a.Thus, anodal 21 possess positive electrode active material layer 21b on the surperficial two sides of the anodal current collection base material 21a except this end.In addition, therefore, anodal current collection base material 21a (the non-formation 21c of portion of positive electrode active material layer) is exposed in this end.On the other hand, negative pole 22 is at the surperficial two sides coating negative electrode active material coating except an end on Width of negative pole current collection base material 22a.Thus, negative pole 22 possesses negative electrode active material layer 22b on the surperficial two sides of the negative pole current collection base material 22a except this end.In addition, therefore, negative pole current collection base material 22a (the non-formation 22c of portion of negative electrode active material layer) is exposed in this end.
It should be noted that, negative electrode active material layer 22b, in order to prevent separating out of dendritic crystal etc., is coated in the fabric width than positive electrode active material layer 21b.In addition, dividing plate 23 is in order to make anodal and negative pole insulation, than positive electrode active material layer 21b and negative electrode active material layer 22b fabric width.But dividing plate 23 is not to covering such width at the non-formation 21c of portion of the outstanding positive electrode active material layer of Width and the non-formation 22c of portion of negative electrode active material layer.
And, the electrode body 20 (rolled electrode body 80) of the battery of recording in following patent documentation 1 is as shown in the concept map of Figure 10, end, the inner circumferential side 22d (solid line) that is wound into negative pole 22 covers anodal 21 end, inner circumferential side 21d (solid line), and negative pole 22 is configured in the interior week of electrode body 20.In addition, the electrode body 20 (electrode group 2) of the battery of recording in following patent documentation 2 is as shown in the concept map of Figure 11, end, the inner circumferential side 21d (solid line) that is wound into positive pole 21 covers end, the inner circumferential side 22d (solid line) of negative pole 22, and anodal 21 are configured in the interior week of electrode body 20.It should be noted that, in Figure 10 and Figure 11, in order easily to understand the appearance of reeling, the positive pole 21 illustrating and the coiling number of turns of negative pole 22 are few.But actual electrode body 20 is with the more number of turns and is closely wound.In addition, in Figure 10 and Figure 11, omit the diagram of dividing plate 23.
Any electrode body 20 is all the shape of flat.Electrode body 20 has the 1st and the 2nd par 20a, 20a and the 1st and the 2nd bend 20b, 20b.The the 1st and the 2nd par 20a, 20a are relative.The the 1st and the 2nd bend 20b, 20b connect each other to the end of the 1st and the 2nd par 20a, 20a.And the front-end edge that the electrode body 20 of recording in patent documentation 1 is wound into end, the inner circumferential side 22d of negative pole 22 is positioned at par 20a.In addition, the front-end edge that the electrode body 20 of recording in patent documentation 2 is wound into end, the inner circumferential side 21d of positive pole 21 is positioned at par 20a.That is,, in any electrode body 20, be disposed at the front-end edge of the end, inner circumferential side of the electrode in interior week and be positioned at par 20a.
Therefore,, in the electrode body 20 of recording at patent documentation 1 (TOHKEMY 2010-287513 communique), end, the inner circumferential side 22d of negative pole 22 easily becomes flexible (double dot dash line represents) in the space content at coiling center.Follow therewith, anodal 21 end, inner circumferential side 21d also easily becomes flexible (double dot dash line represents).In addition, in the electrode body 20 of recording at patent documentation 2 (the JP 2008-251256 of Japan communique), anodal 21 end, inner circumferential side 21d easily becomes flexible (double dot dash line represents) in the space content at coiling center.Follow therewith, end, the inner circumferential side 22d of negative pole 22 also easily becomes flexible (double dot dash line represents).
And if end, the inner circumferential side 22d of negative pole 22 is loosening, or anodal 21 end, inner circumferential side 21d is loosening, anodal 21 and the anode-cathode distance of 22, negative pole expand.In addition, end, the inner circumferential side 22d warpage of negative pole 22, or anodal 21 end, inner circumferential side 21d warpage.And the function of the electrode at this position is impaired.Therefore, produce the problem of the capacity loss of battery.
Summary of the invention
Therefore, the present invention proposes in view of described problem.An object of the present invention is, a kind of end, inner circumferential side or anodal end, inner circumferential side loosening charge storage element in the space at the coiling center of electrode body that can prevent negative pole is provided.
Charge storage element of the present invention possesses electrode body, and this electrode body is by the positive pole of sheet and negative pole, dividing plate to be clipped in the middle and to be reeled to form,
This electrode body has the 1st and the 2nd relative par and to the 1st and the 1st and the 2nd bend that connects each other of the end of the 2nd par, and is the shape of flat,
The either party's of described positive pole and described negative pole electrode cover the opposing party electrode end, inner circumferential side and be configured in interior week of described electrode body,
The end, inner circumferential side of this side's electrode acts on elastic force outwardly with respect to described the opposing party's electrode side.
Charge storage element of the present invention possesses electrode body, and this electrode body is that the positive pole of sheet and negative pole are clipped in the middle dividing plate reel and form.This electrode body has: the 1st and the 2nd relative par; To the 1st and the 1st and the 2nd bend that connects each other of the end of the 2nd par.This electrode body is the shape of flat.The either party's of described positive pole and described negative pole electrode cover the opposing party electrode end, inner circumferential side and be configured in interior week of described electrode body.The end, inner circumferential side of this side's electrode acts on elastic force outwardly with respect to described the opposing party's electrode side.
In addition, as a mode of charge storage element of the present invention, can be that the front-end edge of end, described inner circumferential side of the electrode of one is positioned at the position of turning back a little among described bend, that surpass this bend.
According to described formation, the leading section of the end, inner circumferential side of a side electrode is crooked along the inner surface of bend.Therefore, the leading section of the end, inner circumferential side of a side electrode presents the elastic force that will return as the crow flies, expand outwardly, and thus, is maintained at along the state of the inner surface of electrode body.Therefore, the end, inner circumferential side of a side electrode can not become flexible in the space at coiling center.
In addition, as other modes of charge storage element of the present invention, described bend can be that radius of curvature is circular-arc shape more than 0.1mm.
In addition, as the other mode of charge storage element of the present invention, the front-end edge of the end, described inner circumferential side of described the opposing party's electrode can be positioned at described par.
In addition, as charge storage element of the present invention and then other mode, the electrode of one can have protuberance and constriction, also possesses the collector body being connected with this constriction.It is outstanding that the direction of protuberance from the side of described the opposing party's electrode to the coiling center along described electrode body is rolled.By the position of opening among described protuberance, from the described inner circumferential side end part interval of the electrode of one is carried out, harness forms constriction.
Now, described constriction can comprise the 1st and the 2nd constriction.The 1st constriction retrains clipping side's side described coiling center, described protuberance of described electrode body.The 2nd constriction retrains clipping the opposing party's side at the described coiling center of described electrode body.
In addition, the position of described constriction on described par can be as upper/lower positions:, and the bend of deflection and the contrary side of described bend at the described front-end edge place of the end, described inner circumferential side of the electrode of one.
In addition, as other modes of charge storage element of the present invention, the electrode that can be one is negative pole, and described the opposing party's electrode is anodal.
So, according to the present invention, can prevent that the end, inner circumferential side of negative pole or the end, inner circumferential side of positive pole are loosening in the space at the coiling center of electrode body.
Accompanying drawing explanation
Fig. 1 represents partly cut-away's front view of battery of an execution mode of charge storage element of the present invention.
Fig. 2 represents the stereogram of the tectosome in the housing of this battery.
Fig. 3 represents the vertical section concept map of the electrode body of this battery.
Fig. 4 (a) represents the front view of the collector body of this battery.
Fig. 4 (b) represents the end view of the collector body of this battery.
Fig. 4 (c) represents the stereogram of the collector body of this battery.
Fig. 5 (a) represents the cross section concept map of electrode body.
Fig. 5 (b) represents the cross section concept map of the state of the end harness of electrode body.
Fig. 5 (c) is illustrated in the cross section concept map of state of the engaged at end collector body of electrode body.
The A-A line profile of Fig. 6 presentation graphs 1.
The B-B line profile of Fig. 7 presentation graphs 1.
Fig. 8 represents the vertical section concept map of the electrode body of other execution modes.
Fig. 9 (a) represents for the key diagram of each key element of the positive plate that forms general electrode body is described.
Fig. 9 (b) represents for the key diagram of each key element of the negative plate that forms this electrode body is described.
Fig. 9 (c) represents for the key diagram of the configuration relation on the Width of positive plate, negative plate and dividing plate is described.
Figure 10 represents the vertical section concept map of existing electrode body.
Figure 11 represents the vertical section concept map of other existing electrode body.
Embodiment
Below, for the battery of an execution mode of charge storage element of the present invention, with reference to Fig. 1～Fig. 7, describe in detail.
As shown in Figure 1 and Figure 2, the battery of present embodiment possesses: metal housing 10, electrode body 20, the electrode terminal 31 of positive pole and the electrode terminal 32 of negative pole, collector body 40, pad parts (when て portion material) 50 etc.Electrode body 20 is housed in the inside of housing 10.Anodal electrode terminal 31 and the electrode terminal 32 of negative pole are outstanding to outside from the inside of housing 10.The end of 40 pairs of electrode body 20 of collector body is connected with electrode terminal 31,32.Pad parts 50 are connected with the end of electrode body 20 with collector body 40 co-operatings.
In addition, housing body 11, at the periphery of OBL bottom 11a, is stood and is provided with the relative 11b of pair of side plates portion and relative pair of end board 11c.Housing body 11 is by making pair of end board 11c (comparing the 11b of pair of side plates portion) in a narrow margin, and forming thus little slim of depth has end square tube shape.
On lid 12, be formed with the hole portion (unnumbered) that power pole terminal 31,32 connects.Electrode terminal 31,32 connects the hole portion of lid 12, and as rivet, is fixed on lid 12.Therefore, the outer end of electrode terminal 31,32 is outstanding from lid 12, and the inner end of electrode terminal 31,32 is interior outstanding to housing 10.
The difference of the electrode body that the electrode body that electrode body 20 and the above-mentioned patent documentation 1 of present embodiment recorded or above-mentioned patent documentation 2 are recorded is: observing Fig. 3 can be clear and definite, end, the inner circumferential side 22d that the electrode body 20 of present embodiment is wound into negative pole 22 covers anodal 21 end, inner circumferential side 21d, and negative pole 22 is configured in the interior week of electrode body 20.And then the front-end edge 22d' that electrode body 20 is wound into end, the inner circumferential side 22d of negative pole 22 is positioned on the position over a C that turns back of bend 20b, this point is also different from the electrode body that above-mentioned patent documentation 1 or above-mentioned patent documentation 2 are recorded.It should be noted that, in Fig. 3, in order easily to understand the appearance of reeling, the positive pole 21 illustrating and the coiling number of turns of negative pole 22 are few.But actual electrode body 20 is with the more number of turns and closely reel.In addition, in Fig. 3, omit the diagram of dividing plate 23.
In the present embodiment, bend 20b is the shape of semicircle shape.That is, bend 20b has the angular range of 180 degree.Therefore, turn back a C in it half 90 degree points.Given this, when establishing the par 20a on figure right side, be the 1st par 20a1, the par 20a in figure left side is the 2nd par 20a2, the bend 20b of figure upside (the peristome side of housing body 11) is the 1st bend 20b1, when the bend 20b of figure downside (the bottom 11a side of housing body 11) is the 2nd bend 20b2, as long as the front-end edge 22d' of end, the inner circumferential side 22d of negative pole 22 is positioned at following angular range: from the angular range of the terminal (tie point of the 2nd bend 20b2 and the 2nd par 20a2) of a C to the 2 bend 20b2 that turn back of the 2nd bend 20b2, the initial point (tie point of the 2nd bend 20b2 and the 1st par 20a1) of establishing the 2nd bend 20b2 is the angular ranges of 0 degree of 90～180 while spending.
The front-end edge 21d' of anodal 21 end, inner circumferential side 21d is positioned at the 1st par 20a1.In more detail, the front-end edge 21d' of anodal 21 end, inner circumferential side 21d be positioned among the 1st par 20a1, than intermediate point more by the position of terminal (tie point of the 1st par 20a1 and the 2nd bend 20b2) side of the 1st par 20a1.
Thus, the leading section of end, the inner circumferential side 22d of negative pole 22 bends to circular-arc shape along the inner surface of bend 20b.On the other hand, the leading section of anodal 21 end, inner circumferential side 21d is not crooked, but is straight along the inner surface of par 20a.
It should be noted that, the 1st and the 2nd bend 20b1,20b2 are that radius of curvature is separately circular-arc shape more than 0.1mm.
When reeling positive pole 21, negative pole 22 and dividing plate 23, positive pole 21 and negative pole 22 stagger to the left and right on Width.Thus, as shown in Fig. 5 (a), distolateral in electrode body 20, is extruded with the non-formation 21c of portion of positive electrode active material layer from the side of negative pole 23, distolateral at another of electrode body 20, from anodal 21 side, is extruded with the non-formation 22c of portion of negative electrode active material layer.Thus, electrode body 20 at one end side has anodal protuberance 20c, and at another distolateral protuberance 20c with negative pole.
As shown in Fig. 5 (b), anodal protuberance 20c has constriction 20d and rake 20e.The protuberance 20c of negative pole also has constriction 20d, rake 20e.Constriction 20d formed the leading section harness of this protuberance 20c by mutually connecting airtight thus by the stage before engaging with collector body 40.Rake 20e tilts towards constriction 20d from the base end side of protuberance 20c.
And, as shown in Fig. 5 (c), in the one side of the constriction 20d of anodal protuberance 20c, configure anodal collector body 40, at the another side configuration pad parts 50 of constriction 20d.Anodal collector body 40 and pad parts 50 are for example formed by aluminum or aluminum alloy.Anodal collector body 40 and pad parts 50 are for example engaged and are engaged by ultrasonic wave together with constriction 20d.In the one side of the constriction 20d of the protuberance 20c of negative pole, dispose the collector body 40 of negative pole, at the another side of constriction 20d, dispose pad parts 50.The collector body 40 of negative pole and pad parts 50 are for example formed by copper or copper alloy.The collector body 40 of negative pole and pad parts 50 are for example engaged and are engaged by ultrasonic wave together with constriction 20d.
Get back to Fig. 1 and Fig. 2, the electrode body 20 of making is as described above accommodated in housing 10 in the wireline reel mode parallel with the bottom 11a of housing 10.That is, a pair of protuberance 20c, the 20c of electrode body 20 stand facing each other with the 11c of each end plate portion of housing 10 respectively.
It should be noted that, anodal collector body 40 is for example formed by aluminum or aluminum alloy.The collector body 40 of negative pole is for example formed by copper or copper alloy.
In collector body 40, using pars intermedia 43 as folding line, make inner connecting portion 41 and electrode add portion 42 towards right angle orientation (being L font during top view).Inner connecting portion 41, under the state of the inside of the lid 12 with housing 10 insulation, is configured to along the inside of the lid 12 of housing 10.At the leading section of inner connecting portion 41, be provided with for embedding the through hole 41a of inner end of the electrode terminal 32 of anodal electrode terminal 31 or negative pole.
Electrode is added portion 42 and is configured between the end of electrode body 20 and the 11c of end plate portion of housing body 11.As shown in Figure 4, electrode is added portion 42 and is possessed peristome 42a.On the both sides of peristome 42a, with the same direction of inner connecting portion 41 on projected state, be provided with two brace 42b, 42b.Peristome 42a and brace 42b, 42b cut otch along its length by adding at shaped electrode under the state of the banded plate before portion 42, and the both sides of this otch are erected form.
As shown in Figure 6, the protuberance 20c of electrode body 20 forms a pair of at anodal, negative pole.That is, the protuberance 20c of electrode body 20 comprises the 1st and the 2nd protuberance 20c, the 20c that clips the coiling center of electrode body 20 and configure.The 1st protuberance 20c has interval with the 2nd protuberance 20c and is relative.Therefore, a pair of brace 42b, the 42b of collector body 40 are inserted into the spatial portion between the 1st protuberance 20c and the 2nd protuberance 20c.Under this state, a side brace 42b is along the inner surface of the constriction 20d of the 1st protuberance 20c, and the opposing party's brace 42b is along the inner surface of the constriction 20d of the 2nd protuberance 20c.In addition, the 1st pad parts 50 are along the outer surface of the constriction 20d of the 1st protuberance 20c, and the 2nd pad parts 50 are along the outer surface of the constriction 20d of the 2nd protuberance 20c.Under this state, on brace 42b, pay for anvil block first, on pad parts 50, pay for ultrasonic vibration part first.And, by making ultrasonic vibration part carry out ultrasonic vibration, thereby producing frictional heat, brace 42b and pad parts 50 are engaged by ultrasonic wave together with constriction 20d.
As shown in Figure 7, a pair of brace 42b, the 42b of collector body 40 and the 1st and the 2nd pad parts 50,50 be configured among the 1st and the 2nd par 20a1,20a2, the position of deflection the 1st bend 20b1 (the bend 20b of the peristome side of housing body 11).The front-end edge 22d' of end, the inner circumferential side 22d of the negative pole 22 in interior week of electrode body 20 is positioned at the 2nd bend 20b2 (the bend 20b of the bottom 11a side of housing body 11).Thus, a pair of brace 42b, the 42b of collector body 40 and the 1st and the 2nd pads each group of parts 50,50, is engaged in constriction 20d, the 20d of electrode body 20 at the isolated position of 22d, end, inner circumferential side from negative pole 22.
Above, according to the battery of present embodiment, as shown in Figure 3, negative pole 22 covers anodal 21 end, inner circumferential side 21d and is configured in the interior week of electrode body 20, and the front-end edge 22d' of end, the inner circumferential side 22d of negative pole 22 is positioned at the position that surpasses a C that turns back among the 2nd bend 20b2.Thus, the leading section of end, the inner circumferential side 22d of negative pole 22 bends to circular-arc shape along the inner surface of the 2nd bend 20b2.Therefore, the leading section of end, the inner circumferential side 22d of negative pole 22 presents wants the straight elastic force F returning, the expansion of Yao Xiang foreign side, and it is maintained at along the state of the inner surface of electrode body 20 thus.Therefore, end, the inner circumferential side 22d of negative pole 22 can not become flexible in the space at coiling center.Therefore, can not produce following situation: the anode-cathode distance that positive pole 21 and negative pole are 22 expands, or end, the inner circumferential side 22d warpage of negative pole 22, thereby damage the function of the electrode at this position, cause battery capacity to decline.It should be noted that, when the position of the front-end edge 22d' of the end, inner circumferential side of negative pole 22 22d is to be no more than in the situation at position of a C that turns back of the 2nd bend 20b2, the bending length of the leading section of end, inner circumferential side 22d is inadequate, and end fully presents wants the straight elastic force F returning, therefore not preferred.
In addition, according to the battery of present embodiment, as shown in Figure 7, each group of a pair of brace 42b, the 42b of collector body 40 and the 1st and the 2nd pad parts 50,50 is engaged in constriction 20d, the 20d of electrode body 20 at the isolated position of 22d, end, inner circumferential side from negative pole 22.In the situation that the group of brace 42b and pad parts 50 is configured in the position of end, the inner circumferential side 22d that sandwiches negative pole 22, end, the inner circumferential side 22d of negative pole 22 is restrained, does not therefore produce end, inner circumferential side 22d loosening of negative pole 22.But, each assembly of a pair of brace 42b, the 42b of collector body 40 and the 1st and the 2nd pad parts 50,50 is being set to from the isolated situation of end, inner circumferential side 22d of negative pole 22, in order to prevent end, inner circumferential side 22d loosening of negative pole 22, it is very significant that end, the inner circumferential side 22d of negative pole 22 is disposed to above-mentioned position.
In addition, according to the battery of present embodiment, the 1st and the 2nd bend 20b1, the 20b2 of electrode body 20 are respectively circular-arc shapes more than radius of curvature 0.1mm.In the situation of radius of curvature less than 0.1mm, the space at the coiling center of electrode body 20 is very narrow, is difficult to produce end, inner circumferential side 22d loosening of negative pole 22.But in the situation that radius of curvature is more than 0.1mm and the space broadness at the coiling center of electrode body 20, in order to prevent end, inner circumferential side 22d loosening of negative pole 22, it is very significant that end, the inner circumferential side 22d of negative pole 22 is configured in to above-mentioned position.
In addition, according to the battery of present embodiment, the front-end edge 21d' of anodal 21 end, inner circumferential side 21d is positioned at the 1st par 20a1.The material with carbon elements that the lithium transition metal composite oxide that positive active material adopts etc. generally adopt than negative electrode active material etc. are hard.Therefore, positive electrode active material layer 21b is generally hard than negative electrode active material layer 22b.Therefore, if anodal 21 end, inner circumferential side 21d reels with little radius of curvature, there is positive electrode active material layer 21b warpage, or situation about peeling off from anodal current collection base material 21a.By the front-end edge 21d' of anodal 21 end, inner circumferential side 21d is disposed to par 20a, thereby can not produce this problem.
In addition, according to the battery of present embodiment, on the 1st and the 2nd protuberance 20c, the 20c configuring clipping the coiling center of electrode body 20, be provided with two (a pair of) constriction 20d, 20d.The 1st constriction 20d is formed at the 1st protuberance 20c.The 2nd constriction is formed at the 2nd protuberance 20c.In the situation that being provided with two protuberance 20d, compare with the situation that arranges, can relax the inclination of rake 20e.Therefore, width that can constriction uncoated portion, consequently, can improve battery capacity.But in the situation that two protuberance 20d are set, owing to occurring space at coiling center, so end, the inner circumferential side 22d of negative pole 22 is easily loosening.Therefore it is very significant, end, the inner circumferential side 22d of negative pole 22 being disposed to above-mentioned position.
It should be noted that, charge storage element of the present invention is not limited to the formation of above-mentioned execution mode.In addition, charge storage element of the present invention is also not limited to above-mentioned action effect.Charge storage element of the present invention can carry out various changes in the scope that does not depart from main idea of the present invention.
For example, in the above-described embodiment, be disposed at electrode body 20 interior week be negative pole 22, be specifically designed to loosening (shake from side to side and swing) of end, the inner circumferential side 22d that prevents negative pole 22.But, also can be contrary with it.That is, as shown in Figure 8, anodal 21 cover end, the inner circumferential side 22d of negative poles 22 and are disposed at interior week of electrode body 20, and the front-end edge 21d' of anodal 21 end, inner circumferential side 21d is positioned at position among bend 20b, that surpass a C that turns back.Thus, the leading section of anodal 21 end, inner circumferential side 21d can bend to circular-arc shape along the inner surface of bend 20b.
It should be noted that, now, be disposed at electrode body 20 part in interior week anodal 21, if be formed with the state of positive electrode active material layer (positive active material coated portion) 21b on the surperficial two sides of anodal current collection base material 21a, positive electrode active material layer (positive active material coated portion) 21b forming at the face of the coiling central side of anodal current collection base material 21a exposes in the space at coiling center.Now, separating out of dendritic crystal becomes problem.Therefore, for anodal 21 be disposed at electrode body 20 for the part in interior week, preferably only the one side at anodal current collection base material 21a forms positive electrode active material layer (positive active material coated portion) 21b, at the face of the coiling central side of anodal current collection base material 21a, does not have positive electrode active material layer (positive active material coated portion) 21b.Or negative pole adopts the high active material of lithium titanate equipotential, makes thus separating out of dendritic crystal be difficult to cause.In this case, even if in the part in interior week that is disposed at electrode body 20 of anodal 21, also can form positive electrode active material layer (positive active material coated portion) 21b on the two sides of anodal current collection base material 21a.
In addition, in the above-described embodiment, the front-end edge of the end, inner circumferential side of the electrode in interior week is positioned at the bend 20b of electrode body 20 of the bottom 11a side of housing body 11.The par 20a that approaches bend 20b in the electrode body 20 of the peristome side of the housing body 11 of a side contrary to it connects collector body 40 (pad parts 50 are also modes of collector body).But, also can be contrary with it.; the front-end edge of the end, inner circumferential side of the electrode in interior week is positioned at the bend 20b of electrode body 20 of the peristome side of housing body 11, at the position of the par 20a that approaches bend 20b of the electrode body 20 of the bottom 11a side of the housing body 11 of a side contrary to it, connects collector body 40.
It should be noted that, among the 1st and the 2nd par 20a1,20a2, as long as the right and wrong par 20a at the place, end, inner circumferential side of the electrode in interior week, which position connecting collector body 40 at can.The position of par 20a that can be close at the bend 20b with the front-end edge place of the end, inner circumferential side of the electrode in interior week, connects the brace 42b of collector body 40.
In addition, in the above-described embodiment, at the brace 42b of the internal surface configurations collector body 40 of the constriction 20d of the protuberance 20c of electrode body 20, at the outer surface configuration pad parts 50 of this constriction 20d.But, also can be in contrast.That is, also can be at the brace 42b of the outer surface configuration collector body 40 of the constriction 20d of the protuberance 20c of electrode body 20, at the internal surface configurations pad parts 50 of described constriction 20d.
In addition, in the above-described embodiment, the brace 42b of collector body 40 is connected in electrode body 20 with the group of pad parts 50.But collector body 40 is not limited to this with the form that is connected of electrode body 20.For example, also can with clip (end diagram), clip the protuberance 20c of electrode body 20, on this clip, connect collector body 40.Now, collector body 40 is connected in electrode body 20 indirectly.
In addition, in the above-described embodiment, the brace 42b of collector body 40 is engaged by ultrasonic wave with pad parts 50.But, be not limited to this.Joint, except ultrasonic wave engages, can also be undertaken by various means such as electric resistance welding, Laser Welding, riveted joints.But, consider impact, the sputter of hot positive electrode active material 21b or negative electrode active material layer 22b, the energising resistance at junction surface.Workability etc., wish to be engaged and carried out by ultrasonic wave.
In addition, in the above-described embodiment, lithium rechargeable battery is illustrated.But the kind of battery, size (capacity) are arbitrarily.
In addition, the invention is not restricted to lithium rechargeable battery.The present invention, except various secondary cells, can also be applicable to the capacitors such as primary cell or double charge layer capacitor.
Claims (8)
1. a charge storage element, it possesses electrode body, and this electrode body is that the positive pole of sheet and negative pole are clipped in the middle dividing plate reel and form,
This electrode body has the 1st and the 2nd relative par and to the 1st and the 1st and the 2nd bend that connects each other of the end of the 2nd par, and this electrode body is the shape of flat,
The either party's of described positive pole and described negative pole electrode cover the opposing party electrode end, inner circumferential side and be configured in interior week of described electrode body,
The end, inner circumferential side of this side's electrode acts on elastic force outwardly with respect to described the opposing party's electrode side.
2. charge storage element as claimed in claim 1, wherein,
The front-end edge of the end, described inner circumferential side of the electrode of one is positioned at the position of turning back a little among described bend, that surpass this bend.
3. charge storage element as claimed in claim 1 or 2, wherein,
Described bend is that radius of curvature is circular-arc shape more than 0.1mm.
4. charge storage element as claimed any one in claims 1 to 3, wherein,
The front-end edge of the end, described inner circumferential side of described the opposing party's electrode is positioned at described par.
5. the charge storage element as described in any one in claim 1 to 4, wherein,
The electrode of one has protuberance and constriction,
It is outstanding that the direction of described protuberance from the side of described the opposing party's electrode to the coiling center along described electrode body is rolled,
Described constriction carries out harness to the position of opening among described protuberance, from the described inner circumferential side end part interval of the electrode of one and forms,
Also possesses the collector body being connected with this constriction.
6. charge storage element as claimed in claim 5, wherein,
Described constriction comprises the 1st constriction and the 2nd constriction,
Described the 1st constriction retrains clipping side's side of described protuberance of both sides at the described coiling center of described electrode body,
Described the 2nd constriction retrains the opposing party's side of the described protuberance of both sides.
7. the charge storage element as described in claim 5 or 6, wherein,
The formation position of described constriction on described par is: the bend of the side that deflection is contrary with the described bend at the described front-end edge place of the end, described inner circumferential side of the electrode of one.
8. the charge storage element as described in any one in claim 1 to 7, wherein,
The electrode of one is negative pole, and described the opposing party's electrode is anodal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012201335A JP6103342B2 (en) | 2012-09-13 | 2012-09-13 | Electricity storage element |
| JP2012-201335 | 2012-09-13 |
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| Publication Number | Publication Date |
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| CN103682465A true CN103682465A (en) | 2014-03-26 |
| CN103682465B CN103682465B (en) | 2017-10-31 |
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| Country | Link |
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| US (1) | US9159501B2 (en) |
| EP (1) | EP2709126B1 (en) |
| JP (1) | JP6103342B2 (en) |
| KR (1) | KR102123699B1 (en) |
| CN (1) | CN103682465B (en) |
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| CN108886171A (en) * | 2016-03-24 | 2018-11-23 | 株式会社Lg化学 | battery |
| CN109478693A (en) * | 2016-07-15 | 2019-03-15 | 株式会社杰士汤浅国际 | The manufacturing method of charge storage element and charge storage element |
| CN112740457A (en) * | 2018-11-28 | 2021-04-30 | 三洋电机株式会社 | Nonaqueous electrolyte secondary battery |
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| JP6340925B2 (en) * | 2014-06-09 | 2018-06-13 | 株式会社豊田自動織機 | Power storage device |
| JP2016039041A (en) * | 2014-08-07 | 2016-03-22 | 株式会社Ｇｓユアサ | Power storage element and manufacturing method for the same |
| KR102211330B1 (en) | 2014-10-30 | 2021-02-04 | 삼성전자주식회사 | Inductor device |
| JP7372274B2 (en) | 2021-02-22 | 2023-10-31 | プライムプラネットエナジー＆ソリューションズ株式会社 | secondary battery |
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- 2013-08-21 CN CN201310367117.9A patent/CN103682465B/en active Active
- 2013-09-03 KR KR1020130105217A patent/KR102123699B1/en active IP Right Grant
- 2013-09-10 US US14/023,341 patent/US9159501B2/en not_active Expired - Fee Related
- 2013-09-12 EP EP13184119.9A patent/EP2709126B1/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108886171A (en) * | 2016-03-24 | 2018-11-23 | 株式会社Lg化学 | battery |
| CN108886171B (en) * | 2016-03-24 | 2021-04-09 | 株式会社Lg化学 | Battery with a battery cell |
| CN109478693A (en) * | 2016-07-15 | 2019-03-15 | 株式会社杰士汤浅国际 | The manufacturing method of charge storage element and charge storage element |
| CN112740457A (en) * | 2018-11-28 | 2021-04-30 | 三洋电机株式会社 | Nonaqueous electrolyte secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| KR102123699B1 (en) | 2020-06-16 |
| JP6103342B2 (en) | 2017-03-29 |
| US20140072849A1 (en) | 2014-03-13 |
| CN103682465B (en) | 2017-10-31 |
| EP2709126A1 (en) | 2014-03-19 |
| EP2709126B1 (en) | 2020-04-01 |
| KR20140035249A (en) | 2014-03-21 |
| US9159501B2 (en) | 2015-10-13 |
| JP2014056742A (en) | 2014-03-27 |
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